[NLRS] 439MHZ Radar

[Dr. Gerald N. Johnson, electrical engineer]

Yes, I learned about those problems from a roof leak. The facilities
engineer (W0NJ) for a local manufacturing company called me to solve an
argument. Their new solid state telephone exchange had fried boards,
missing traces, and puffy electrolytics. Some blamed a freon leak from
the air conditioner, some blamed a roof leak alongside a conduit. Both
were directly over the exchange. I took the boards and then swabbed the
"water" streaks down the door panels to a chemist and had them analyzed
looking for Fl/Cl in the corrosion products. Found none, so I blamed it
on water from the roof leak. Shortly after that there was "range" hood
in door roof protecting the telephone exchange. Probably made of
stainless steel but it cost a whole lot less than the boards and my
fees. And W0NJ didn't have grounds to sue the air conditioner people for
letting the freon leak. Had to blame the water on his own maintenance
people punching that conduit (1/2") hole in the roof over the telephone
exchange.

73, Jerry, K0CQ
-- 
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.